package com.sali.controller.code;


import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import com.sali.commons.BaseController;
import com.sali.redis.util.RedisUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.util.concurrent.TimeUnit;

/**
 * 验证码
 */
@RestController
public class CodeController extends BaseController {

    @Autowired
    private Producer captchaProducer;
    @Resource
    private RedisUtil<String> redisUtil;

    /**
     * 获取图片验证码
     */
    @GetMapping("/code/get")
    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
        HttpSession session = request.getSession();
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");
        response.setContentType("image/jpeg");
        String uuid = request.getParameter("uuid");
        //生成验证码
        String capText = captchaProducer.createText();
        redisUtil.set(Constants.KAPTCHA_SESSION_KEY+":"+ uuid, capText,2L, TimeUnit.MINUTES);
        //向客户端写出
        BufferedImage bi = captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
    }
}
